scholarly journals Intelligent programming of robotic flange production by means of CAM programming

2019 ◽  
Vol 9 (1) ◽  
pp. 571-579
Author(s):  
Peter Tirpak ◽  
Peter Michalik ◽  
Jozef Dobransky ◽  
Jozef Macej ◽  
Michal Petrus
Keyword(s):  
Cylindrical Surface ◽  
3D Model ◽  
Cutting Conditions ◽  
Measuring Device ◽  
Program Generation ◽  
Face Area ◽  
Nc Program ◽  
The Mean ◽  
Software Extension ◽  
Intelligent Programming

AbstractThe article deals with the description of the production programming of a robotic flange, which consists of outer conical, cylindrical surface, face area and internal threaded surfaces. For the modelling of a 3D model and the generation of production design, the Autodesk Inventor Professional 2018 software was used. To enter the semi-finished piece, select individual tools, cutting conditions, simulation and the NC program generation for RS Fanuc, the HSMPRO 2018 software extension was used. The circularity deviation was measured using the Roundtest RA 120 measuring device. The mean arithmetic values of roughness for the hole were: D = 126, Rz = 11.43 μm, Ra = 1.92 μm. The circularity deviation was 22.3 μm.

Evaluation and Improvement of Productivity in High-Speed NC Machining

1999 ◽  
Vol 122 (3) ◽  
pp. 556-561 ◽  
Author(s):  
X. Yan ◽  
K. Shirase ◽  
M. Hirao ◽  
T. Yasui
Keyword(s):  
High Speed ◽  
Nc Machining ◽  
Cutting Conditions ◽  
High Speed Machining ◽  
Machining Time ◽  
Time Constants ◽  
Nc Program ◽  
Kinematic Factor ◽  
Two Factors

The productivity of machining centers is influenced inherently by the quality of NC programs. To evaluate productivity, first an effective feedrate factor and a productivity evaluation factor are proposed. It has been found that in high-speed machining, these two factors depend on a kinematic factor which is a function of (1) command feedrate, (2) average per-block travel of the tool, (3) moving vectorial variation of the tool, and (4) ac/deceleration or time constants. Then an NC program simulator has been developed to evaluate productivity. With the simulator, the machining time can be calculated accurately and the cutting conditions can be extracted. Finally, three NC programs were implemented on high-speed machining centers and analyzed by the simulator. It was found that in mold and die machining, the productivity can be improved by increasing the acceleration and average travel and reducing the vectorial variation of the tool rather than the command feedrate. [S1087-1357(00)01303-4]

scholarly journals Effects of Air Pollution on the Vital Capacity of Commercial Motorcyclists in Nigeria Population

2020 ◽  
pp. 1-7
Author(s):  
G. U. Ezeja ◽  
C. U. Onwudiwe ◽  
O. D. Nwodo ◽  
G. Umahi-Ottah ◽  
N. D. Nwobodo
Keyword(s):  
Air Pollution ◽  
Vital Capacity ◽  
Health Workers ◽  
Test Group ◽  
Ambient Air ◽  
Ambient Air Pollution ◽  
Control Group ◽  
African Countries ◽  
Measuring Device ◽  
The Mean

Background: Ambient air pollution is a serious challenge to human health in most West African countries including Nigeria. Objective: The objective of the study was to determine the effects of dust inhalation on the vital capacity of commercial motorcyclists in Abakaliki metropolis. Methods: 200 subjects participated in this study, 100 commercial motorcyclists (test group) and 100 non-motorcyclists (control group). The mean ± S.D of their age, height and weight were calculated. Vital capacity was measured using a spirometer. A questionnaire and consent form was filled by every participant before the commencement of the study. A handheld laser dust measuring device called air sampler PCE-PCO 1 was used to analyze the quantity, quality and sizes of particulate matters present in the research area. Data were analyzed using descriptive and inferential statistics; Mean and standard deviations were calculated and the Z-test was used to test if the mean were significantly different. Level of significance was set at 95%. Results: The age of participants were within the range of 25 – 30 years. Commercial motorcyclists were exposed to particulate matter 0.5, 1.0 and 2.5 µm. The vital capacity of commercial motorcyclists was significantly lower than that of non-motorcyclists (p =0.01). Furthermore, a significant decrease in the vital capacity of commercial motorcyclists was observed when correlated with the number of years spent in the job (p = 0.03). There was also a significant correlation between vital capacity and hours spent per week among commercial motorcyclists (r = 0.245). Conclusion: Commercial motorcyclists need to be encouraged to adopt respiratory health safety strategies like use of full-face helmets, practice of active cycle of breathing techniques and also, be educated on air pollution hazards by public health workers.

scholarly journals Sealing Ability of AH Plus and GuttaFlow Bioseal

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Soo-Hyuk Lee ◽  
Soram Oh ◽  
Adel Saeed Al-Ghamdi ◽  
Ayman Omar Mandorah ◽  
Kee-Yeon Kum ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Root Canal ◽  
Glass Ceramics ◽  
Filling Material ◽  
Root Canal Filling ◽  
Measuring Device ◽  
Gutta Percha ◽  
Sealing Ability ◽  
Ah Plus ◽  
The Mean

The objective of root canal obturation is to achieve a fluid-tight seal. Recently, GuttaFlow bioseal (GB), a root canal sealer composed of polydimethylsiloxane, gutta-percha particles, and bioactive glass ceramics, has been developed, to enhance the sealing ability of root canal filling material. The objective of this study was to assess the sealing ability of GB using a subnanoliter-scaled fluid-flow measuring device and to compare with that of AH Plus (AH). The fluid flow in root canal-filled teeth using either gutta-percha cone (GP) with AH (GAR; n = 10) or GP with GB (GBR; n = 10) and in GP inserted in AH blocks (GA; n = 10) or GP inserted in GB blocks (GB; n = 10) was measured. In addition, fluid flow in sealer blocks of AH (A; n = 10) and GB (B; n = 10), which served as negative controls, was measured. Root canal-filled teeth using GP without any sealer (GR) acted as positive controls (n = 10). The leakage was obtained by calculating the volume of moved water by time (s), after stabilization of the fluid flow was achieved. Statistical analysis was performed using the Kruskal–Wallis test and Mann–Whitney U-test with Bonferroni correction. A p value less than 0.00238 (0.05/21) was considered significantly different. The mean leakages (nL/s) in the groups are as follows: GAR, 0.0958 ± 0.0543; GBR, 0.0223 ± 0.0246; GA, 0.0644 ± 0.0803; GB, 0.0267 ± 0.0182; A, 0.0055 ± 0.0057; B, 0.0052 ± 0.005; and GR, 0.2892 ± 0.3018. The mean leakage in the GBR group was lower than that in the GAR group (p = 0.001), while the mean leakages in the GA and GB groups were not significantly different. GuttaFlow bioseal can be useful in single-cone obturation technique.

scholarly journals Application of 3D Computed Tomography Reconstruction Images to Assess the Thickness and Dimensions of the Posterior Palatal Seal Area

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Soeun Lim ◽  
Seoung-Jin Hong ◽  
Joo-Young Ohe ◽  
Janghyun Paek
Keyword(s):  
Computed Tomography ◽  
3D Model ◽  
Three Dimensional ◽  
Ct Images ◽  
Anterior Border ◽  
Lateral Direction ◽  
Mean Dimension ◽  
The Mean ◽  
The Right ◽  
Palatal Mucosa

Few studies have been reported on the scientific measurements of the thickness and dimensions of the posterior palatal seal (PPS) area. The purpose of this study is to measure and analyze the thickness of palatal mucosa by using a three-dimensional (3D) model reconstructed with computed tomography (CT) images and to present objective values by identifying the PPS area. The CT images were reconstructed as a 3D model by separating the maxillary palate mucosa and teeth. Each reconstructed model was analyzed and the thickness was measured at 93 crossing points of each divided plane. The dimension of the PPS area was measured and the right and left dimensions of the PPS area were compared. The thickness of the palatal mucosa was thicker toward the posterior area. The thickness increased in the lateral direction and decreased again. In the PPS area, the mean dimension between the rearmost of anterior border and the most posterior line was 2.19 mm and the mean dimension between the forefront of anterior border and the most posterior line was 5.19 mm in the right side and 5.16 mm in the left side. The mean dimension from the center of the palate to the right most forward point was 6.85 mm, and the left was 7.36 mm. The new measurement method of palatal mucosal thickness is noninvasive, accurate, and easy to store and study, so it can be used effectively in planning and manufacturing the maxillary complete denture in the digital workflows.

Group Technology Utilization inside New Software Application

2012 ◽  
Vol 229-231 ◽  
pp. 2765-2769 ◽  
Author(s):  
Katarina Monkova ◽  
Peter Monka
Keyword(s):  
3D Model ◽  
Group Technology ◽  
Hybrid Approach ◽  
Program System ◽  
Application System ◽  
Software Application ◽  
Process Plans ◽  
Nc Program ◽  
Cad Cam ◽  
Technological Documentation

The article deals with the utilization of group technology inside new software. This software aids the multivariant manufacturing process plans creation and consequently it supported the processing of information in several versions. It can be used for optimization according to the selected criteria, for the generation of technological documentation and NC programs on the basis of hybrid approach. NC program, as one of process plans form, can be for individual parts generated automatically on the basis of group representative that is created as 3D model in CAD/CAM system. The output of CAM module – CL data – is imported into new software application as the basis of NC program. System was called Individual Application system – IAS.

A Method for Using a Virtual Machining Simulation to Consider Both Equivalent CO2Emissions and Machining Costs in Determining Cutting Conditions

2015 ◽  
Vol 9 (2) ◽  
pp. 115-121 ◽  
Author(s):  
Hirohisa Narita ◽  
Keyword(s):  
Evaluation System ◽  
Cutting Tool ◽  
Cutting Speed ◽  
Cutting Conditions ◽  
Machining Process ◽  
Machining Simulation ◽  
End Mill ◽  
Virtual Machining ◽  
Mill Operation ◽  
Nc Program

An evaluation system for calculating equivalent CO2emissions and machining costs is developed using an activity-based model. The system can evaluate a machining process from an NC program, workpiece information, and cutting tool information, and it can then calculate accurate equivalent CO2emissions and the machining cost. The cutting speed of an end mill operation is evaluated in terms of the equivalent CO2emission and the machining cost. Based on the results, optimal cutting conditions are determined to minimize the equivalent CO2emissions and the machining cost to the extent possible.

An Accuracy-Prediction Model Taking Tool Deformation and Geometric Machine-Tool Error into Consideration

2010 ◽  
Vol 4 (3) ◽  
pp. 235-242 ◽  
Author(s):  
Hirohisa Narita ◽  
◽  
Keiichi Shirase ◽  
Eiji Arai ◽  
Hideo Fujimoto ◽  
...  
Keyword(s):  
Prediction Model ◽  
Machine Tool ◽  
End Milling ◽  
Geometric Error ◽  
Cutting Conditions ◽  
Error Prediction ◽  
Machining Accuracy ◽  
Trial And Error ◽  
Virtual Machining ◽  
Nc Program

Test cutting used to verify cutting conditions and machining accuracy after a numeric control (NC) program is written for end milling the mold and die indispensable to manufacturing is generally effective, because it is based on trial and error. The virtual machining simulator we designed to verify machining accuracy uses an accuracy-prediction model and an error prediction expression for workpieces, integrating machine-tool deformation and geometric error models. We also propose calculation for copying errors to a workpiece.

Shape Investigation of Worn Cutting Inserts with Utilization of Active Triangulation

2013 ◽  
Vol 581 ◽  
pp. 22-25 ◽  
Author(s):  
Ladislav Morovič ◽  
Juraj Vagovský ◽  
Ivan Buranský
Keyword(s):  
Measurement Method ◽  
3D Model ◽  
Fringe Projection ◽  
3D Scanner ◽  
Measuring Device ◽  
Geometrical Properties ◽  
Cutting Insert ◽  
Cutting Inserts ◽  
Different Shapes ◽  
Active Triangulation

The paper deals with utilization of active triangulation method for shape investigation of cutting inserts after wear. For measuring of cutting insert shape a method using the structured light (fringe projection) was used. As a measuring device the optical 3D scanner GOM ATOS II TripleScan SO was used. Cutting inserts with different shapes was measured. With the measurement method mentioned in the paper the accurate shape of the cutting insert can be captured. From the 3D model moreover it is possible to measure the geometrical properties as well as tool wear, plastical deformation, build-up-edge, corner damage and chipping of cutting insert.

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